In practice, "Claim_Ocean" tech flag granting techs are far too powerful. The purpose of the flag was to make it possible to give oceanic cities tiles to work on more than the central 9. In practice the tech blocks most of the movement of peaceful ships anywhere near the land cities even if player never builds any oceanic cities.

Attached patch makes only Oceanic border sources to be able to claim oceanic tiles even when tech with "Claim_Ocean" flag is known.

Is it ok to just change the "Claim_Ocean" flag like this, or do we need to provide method for getting the old behavior, in case some ruleset has been built to depend on it on 2.5?

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